alleryStart learning →Is ZnCO3(s) giving ZnO(s) and CO2(g) a redox reaction?
ANo, since no oxidation number changes
BYes, since zinc is oxidized to ZnO
CYes, since carbon is reduced to CO2
DNo, since a gas is released as product
Answer & Solution
Correct answer: A. No, since no oxidation number changes
1. In ZnCO3 zinc is +2, carbon is +4 and oxygen is -2.
2. In ZnO zinc is still +2 and oxygen is still -2.
3. In CO2 carbon is still +4 and oxygen is still -2.
4. No element changes oxidation number, so this is not a redox reaction.
5. Releasing a gas is not the test; the test is a change in oxidation number.
_Source: OpenStax Chemistry (CC BY 4.0), Ch 4 "Stoichiometry of Chemical Reactions", section 4.2 Classifying Chemical Reactions_
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